| Summary: | define the distribution of crustal types at continentalmargins, with specific focus on the conjugate Australia-Antarctica margins. Previous studies have used featuresin gravity maps as a proxy for the pre-rift location ofplate boundaries. Instead, we discuss the use of potentialfield data to define the boundaries of stretchedcontinental crust on a regional scale, and demonstrate thisprocess for the conjugate margins of South Australia andAntarctica. In a companion paper (Whittaker et al, 2010)we show how these boundaries are used along withestimates of crustal thickness to determine the location ofthe plate boundaries prior to rifting, and ultimately toderive full-fit plate tectonic reconstructions.
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